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Intangible assets -Schedule of Intangible Assets (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	SFr 64.6	SFr 70.3
Additions	4.5	4.4
Amortization	(10.8)	(10.1)
Exchange Difference		(0.1)
Intangible assets and goodwill at end of the period	58.3	64.6
Gross Carrying Amount
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	101.2	96.9
Intangible assets and goodwill at end of the period	105.7	101.2
Accumulated depreciation
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	(36.6)	(26.6)
Intangible assets and goodwill at end of the period	(47.4)	(36.6)
Patents, licenses and other rights
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	50.9	54.2
Additions	1.4	1.2
Amortization	(4.7)	(4.5)
Exchange Difference		0.0
Intangible assets and goodwill at end of the period	47.5	50.9
Patents, licenses and other rights | Gross Carrying Amount
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	70.4	69.2
Intangible assets and goodwill at end of the period	71.8	70.4
Patents, licenses and other rights | Accumulated depreciation
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	(19.6)	(15.0)
Intangible assets and goodwill at end of the period	(24.3)	(19.6)
Software
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	11.9	14.4
Additions	3.0	3.1
Amortization	(6.0)	(5.5)
Exchange Difference		(0.1)
Intangible assets and goodwill at end of the period	9.0	11.9
Software | Gross Carrying Amount
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	29.0	25.9
Intangible assets and goodwill at end of the period	32.1	29.0
Software | Accumulated depreciation
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	(17.1)	(11.6)
Intangible assets and goodwill at end of the period	(23.1)	(17.1)
Goodwill
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	1.8	1.8
Additions	0.0	0.0
Amortization	0.0	0.0
Exchange Difference		0.0
Intangible assets and goodwill at end of the period	1.8	1.8
Goodwill | Gross Carrying Amount
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	1.8	1.8
Intangible assets and goodwill at end of the period	1.8	1.8
Goodwill | Accumulated depreciation
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets and goodwill at beginning of period	0.0	0.0
Intangible assets and goodwill at end of the period	SFr 0.0	SFr 0.0

X

- Definition

The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard
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X

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2024-03-27

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause vii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_vii&doctype=Standard
-URIDate 2024-03-27

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- Definition

The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

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- References

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